US6183491B1 - Embolic coil deployment system with improved embolic coil - Google Patents
Embolic coil deployment system with improved embolic coil Download PDFInfo
- Publication number
- US6183491B1 US6183491B1 US09/256,161 US25616199A US6183491B1 US 6183491 B1 US6183491 B1 US 6183491B1 US 25616199 A US25616199 A US 25616199A US 6183491 B1 US6183491 B1 US 6183491B1
- Authority
- US
- United States
- Prior art keywords
- coil
- catheter
- embolic
- durometer
- embolic coil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/12—Surgical instruments, devices or methods, e.g. tourniquets for ligaturing or otherwise compressing tubular parts of the body, e.g. blood vessels, umbilical cord
- A61B17/12022—Occluding by internal devices, e.g. balloons or releasable wires
- A61B17/12131—Occluding by internal devices, e.g. balloons or releasable wires characterised by the type of occluding device
- A61B17/1214—Coils or wires
- A61B17/12154—Coils or wires having stretch limiting means
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/12—Surgical instruments, devices or methods, e.g. tourniquets for ligaturing or otherwise compressing tubular parts of the body, e.g. blood vessels, umbilical cord
- A61B17/12022—Occluding by internal devices, e.g. balloons or releasable wires
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00535—Surgical instruments, devices or methods, e.g. tourniquets pneumatically or hydraulically operated
- A61B2017/00539—Surgical instruments, devices or methods, e.g. tourniquets pneumatically or hydraulically operated hydraulically
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/12—Surgical instruments, devices or methods, e.g. tourniquets for ligaturing or otherwise compressing tubular parts of the body, e.g. blood vessels, umbilical cord
- A61B17/12022—Occluding by internal devices, e.g. balloons or releasable wires
- A61B2017/1205—Introduction devices
- A61B2017/12054—Details concerning the detachment of the occluding device from the introduction device
- A61B2017/12081—Details concerning the detachment of the occluding device from the introduction device detachable by inflation
Definitions
- the present invention relates to a medical device for placing an embolic coil at a preselected location within a vessel of the human body, and more particularly, relates to a catheter having a distal tip for retaining the embolic coil in order to transport the coil to a preselected position within the vessel and a control mechanism for releasing the embolic coil at the preselected position.
- Coils which are placed in vessels may take the form of helically wound coils, or alternatively, may be random wound coils, coils wound within other coils or many other such coil configurations. Examples of various coil configurations are disclosed in U.S. Pat. No. 5,334,210, entitled, “Vascular Occlusion Assembly; U.S. Pat. No. 5,382,259, entitled, “Vasoocclusion Coil With Attached Tubular Woven Or Braided Fibrous Coverings.” Embolic coils are generally formed of a radiopaque metallic materials, such as platinum, gold, tungsten or alloys of these metals. Often times several coils are placed at a given location in order to occlude the flow of blood through the vessel by promoting thrombus formation at the particular location.
- embolic coils have been placed within the distal end of the catheter and when the distal end of the catheter is properly positioned the coil may then be pushed out of the end of the catheter with, for example a guidewire, to release the coil at the desired location.
- This procedure of placement of the embolic coil is conducted under fluoroscopic visualization such that the movement of the coil through the vasculature of the body may be monitored and the coil may be placed in the desired location.
- Another coil positioning system utilizes a catheter having a socket at the distal end of the catheter for retaining a ball which is bonded to the proximal end of the coil.
- the ball which is larger in diameter than the outside diameter of the coil, is placed in a socket within the lumen at the distal end of the catheter and the catheter is then moved into a vessel in order to place the coil at a desired position.
- a pusher wire with a piston at the end thereof is pushed distally from the proximal end of the catheter to thereby push the ball out of the socket in order to thereby release the coil at the desired position.
- Another method for placing an embolic coil is that of utilizing a heat releasable adhesive bond for retaining the coil at the distal end of the catheter.
- One such system uses laser energy which is transmitted through a fiber optic cable in order to apply heat to the adhesive bond in order to release the coil from the end of the catheter.
- Such a method is disclosed in U.S. Pat. No. 5,108,407, entitled, “Method And Apparatus For Placement Of An Embolic Coil.”
- Such a system also suffers from the problem of having a separate element which extends throughout the length of the catheter with the resulting stiffness of the catheter.
- Still another method for placing an embolic coil is disclosed in co-pending U.S. patent application Ser. No. 09/177,848, entitled “Embolic Coil Hydraulic Deployment System,” filed on Oct. 21, 1998 and assigned to the same assignee as the present patent application.
- This patent application discloses the use of fluid pressure which is applied to the distal tip of the catheter for expanding the lumen in order to release the embolic coil.
- the present invention is directed toward a vascular occlusive coil deployment system for use in placing an embolic coil at a preselected site within a vessel which includes an elongated, flexible catheter having a distal tip for retaining the coil so that the coil may be moved to the preselected position within the vessel.
- the catheter has a lumen which extends therethrough the length of the catheter and also includes a distal end which is formed of a material having a durometer such that when a fluid pressure of about 90 to 450 pounds per square inch (psi) is applied to the interior of the catheter, the walls of the distal tip expand outwardly, or radially, to thereby increase the lumen of the distal tip of the catheter.
- the proximal end of the embolic coil is placed into the lumen of the distal tip of the catheter and is retained by the distal tip of the catheter.
- a hydraulic injector such as a syringe, is coupled to the proximal end of the catheter for applying a fluid pressure to the interior of the catheter.
- fluid pressure is then applied to the interior of the catheter by the hydraulic injector to thereby cause the walls of the distal tip to expand outwardly to thereby release the coil for placement in the vessel.
- the proximal portion of the coil is modified in a manner so as to “lock” adjacent turns of the coil together to thereby prevent such stretching or unwinding.
- the coil preferably takes the form of a tightly wound helical coil having a proximal end, a distal end and a lumen extending therethrough.
- the coil includes a seal plug which is disposed in fluid-tight engagement within the coil lumen at the proximal end of the coil.
- the coil includes a support wire which extends along the central axis of the coil lumen for a length substantially less than the length of the coil and in which one end of the support wire is fixedly attached to the seal plug and the other end of the support wire is fixedly attached to at least one of the turns of the coil at a point substantially remote from the distal end of the coil.
- the flexible catheter is comprised of a proximal section and a relatively short distal section.
- the proximal section is formed of a material which is sufficiently flexible to be passed through the vasculature of the human body and is of a durometer which essentially resists outward expansion when a fluid pressure on the order of about 90 to 450 psi is applied to the interior of the catheter.
- the distal section of the catheter is formed of a material which is also sufficiently flexible to be passed through the vasculature of the body, yet is of a durometer which is significantly lower than the durometer of the proximal section and exhibits the property of expanding outwardly, or radially, when such a fluid pressure is applied to the interior of the catheter to thereby permit the release of the embolic coil.
- the distal section of the catheter has a durometer in a range of between about 25 D and 55 D.
- the embolic coil is comprised of a helical coil having a proximal end, a distal end, and a lumen extending therethrough.
- a seal plug is disposed within the lumen of the proximal end of the coil in fluid-tight engagement.
- the proximal end of the coil is disposed in a fluid-tight engagement within the lumen of the distal section of the catheter and is retained by the lumen of the catheter for subsequent release.
- the hydraulic injector for applying a fluid pressure to the interior of the catheter takes the form of a syringe which is coupled to the proximal end of the catheter for, upon movement of the piston, creating a fluid pressure which is applied to the interior of the catheter to thereby cause the release of the embolic coil.
- the embolic coil may take the form of other types of implantable devices, such as a vascular filter.
- a method for placing an embolic coil with a selected site within a vessel of the body comprising the steps of advancing a catheter through the vasculature of the body to place an embolic coil which is retained within the lumen of the distal tip of the catheter to a preselected site, applying a fluid pressure to the interior of the catheter to thereby cause the distal tip of the catheter to expand radially outwardly to release the embolic coil at the preselected site, and withdrawing the catheter from the vasculature system.
- the proximal portion of the coil is prevented from stretching or unwinding to thereby prevent the premature release of the coil from the catheter deployment system.
- FIG. 1 is an enlarged, partially sectioned view of the hydraulic vascular occlusive coil deployment system of the present invention
- FIG. 2 is an enlarged partially sectioned view showing the distal end of the coil deployment system prior to deployment of the coil;
- FIGS. 3 and 4 illustrate the sequential steps in the radial expansion of the distal tip of the coil deployment system as the embolic coil is released;
- FIG. 5 illustrates the distal tip of the coil deployment system after release of the embolic coil
- FIG. 6 is a partially sectioned view showing the coil retaining structure of the present invention.
- FIG. 1 generally illustrates the vascular occlusive coil deployment system 100 which is comprised of a hydraulic injector or syringe 102 , coupled to the proximal end of a catheter 104 .
- An embolic coil 106 is disposed within the lumen of the distal end 108 of the catheter. The proximal end of the coil 106 is tightly held within the lumen of the distal section 108 of the catheter 104 until the deployment system is activated for release of the coil.
- the syringe 102 includes a threaded piston 110 which is controlled by a handle 112 for infusing fluid into the interior of the catheter 104 .
- the catheter 104 includes a winged hub 114 which aids in the insertion of the is catheter into the vascular system of the body.
- FIG. 2 illustrates in more detail the distal end of the catheter 104 .
- the catheter 104 includes a proximal section 116 and the distal section 108 .
- the proximal section 118 of the embolic coil 106 is disposed within the distal section 108 of the catheter and is tightly held within the lumen 120 of this distal section 108 prior to release of the coil.
- FIG. 2 illustrates the vascular occlusive coil deployment system prior to activation of the piston of the syringe and prior to release of the coil.
- the embolic coil 106 may take various forms and configurations and may even take the form of a randomly wound coil, however, with the helical wound coil as illustrated in FIG. 2, the coil is provided with a weld bead or seal plug 122 which is disposed in a lumen 123 which lumen extends throughout the length of the coil 106 .
- the seal plug 122 serves to prevent the flow of fluid through the lumen of the coil 106 so that when the coil 106 is placed in fluid-tight engagement with the lumen 120 the coil serves to provide a fluid-tight seal at the distal end of the catheter 104 .
- a liquid silicone material 130 a is injected into the space surrounding the support wire 130 to fill the proximal portion of the lumen of the coil. The silicone material is then cured to seal the proximal end of the coil to prevent fluid leakage through the turns of the coil. The cured remains flexible with the result that the proximal end of the coil remains flexible.
- the proximal section 116 and the distal section 108 of the catheter 104 are formed of materials having different durometers.
- the proximal section 116 is preferably formed of Pebax material having a durometer in a range of about 62 D to 75 D.
- the proximal section is sufficiently flexible to transverse the vasculature of the human body, but is sufficiently rigid such that when a fluid pressure of approximately 90 to 450 psi is applied to the interior of this section of the catheter there is very little, if any, radial expansion of the walls of this section.
- the distal section 108 of the catheter is preferably formed of polymer material with a relatively low durometer which, exhibits the characteristic that when a fluid pressure of approximately 90 to 450 psi is applied to the interior of the catheter the walls of the distal section 108 expand radially, somewhat similar to the action of a balloon inflating, to thereby release the proximal end 118 of the coil 106 .
- the distal section 108 is preferably formed from a block copolymer such as Pebax having a durometer of between 25 D and 55 D with a durometer of 40 D being the preferred durometer.
- FIGS. 3 and 4 generally illustrate the coil release mechanism in action for the vascular occlusive catheter deployment system. More particularly, as shown in FIG. 3, when a hydraulic pressure is applied to the interior 124 of the catheter 104 the relatively low durometer distal section 108 of the catheter begins to expand radially, much as a balloon expands during the process of inflation. As the distal section 108 continues to expand radially there comes a point as illustrated in FIG. 4 in which the coil 106 becomes disengaged from the lumen of the distal section 108 and the coil is then released from the catheter and is deployed at that location within the vessel.
- the catheter may then be withdrawn leaving the coil positioned at the desired site.
- the vaso-occlusion or embolic coil 106 is formed by winding a platinum alloy wire into a tightly wound helical configuration.
- the diameter of the wire is generally in the range of about 0.0015 inches to 0.008 inches.
- the outside diameter of the coil 106 is preferably in a range of about 0.006 inches to 0.055 inches. While the particular embolic coil 106 illustrated in FIG. 6 is shown as being a straight coil it should be appreciated that embolic coils take the form of various configurations and may take the form of a helix, a random shape configuration or even a coil within a coil configuration.
- the first several turns on the proximal end of the embolic coil 106 are retained or held by the distal tip of the catheter as the coil is moved in position. Often times it is necessary to move a coil to a certain position within the vasculature and then to withdraw the coil back to a more proximal position within the vasculature. During the movement of a coil through the vasculature, particularly when the coil is withdrawn to a more proximal position within the vasculature, it is possible to stretch or unwind the turns of the coil. If the turns of the coil which are held by the distal tip of the deployment catheter are stretched or unwound the result is that the outside diameter of the coil decreases with the result that the coil may be prematurely released from the deployment system.
- a platinum support wire 130 is welded to the proximal sealing plug 122 .
- the other end of the platinum support wire 130 is bonded by welding to one of the turns of the coil at a position relatively close to the proximal end of the catheter.
- the embolic coil is of a length in a range of about 1.5 centimeters to 30 centimeters.
- the length of the support wire is of a length in the range of about 0.5 millimeters to about 4 millimeters and the diameter of the support wire is between about 0.0007 and 0.002 inches.
- the proximal sealing plug may take the form of a welded bead which is formed at the end of the support wire 130 .
- the support wire may be attached to the weld bead and to the turns of the coil by soldering, welding, or by the use of an adhesive.
- the support wire could be formed of various different materials including polymers or composites.
- a liquid silicone material 130 a is injected into the space surrounding the support wire 130 to fill the proximal portion of the lumen of the coil. The silicone material is then cured to seal the proximal end of the coil to prevent fluid leakage through the turns of the coil.
- the catheter may be activated by applying a hydraulic pressure to the interior of the catheter to thereby cause the catheter to release the coil and deposit the coil very accurately at the desired location.
Abstract
Description
Claims (17)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US09/256,161 US6183491B1 (en) | 1998-03-10 | 1999-02-22 | Embolic coil deployment system with improved embolic coil |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US7745598P | 1998-03-10 | 1998-03-10 | |
US09/256,161 US6183491B1 (en) | 1998-03-10 | 1999-02-22 | Embolic coil deployment system with improved embolic coil |
Publications (1)
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US6183491B1 true US6183491B1 (en) | 2001-02-06 |
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Application Number | Title | Priority Date | Filing Date |
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US09/256,161 Expired - Lifetime US6183491B1 (en) | 1998-03-10 | 1999-02-22 | Embolic coil deployment system with improved embolic coil |
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US (1) | US6183491B1 (en) |
EP (1) | EP0941704B1 (en) |
JP (1) | JP3930189B2 (en) |
CA (1) | CA2264988C (en) |
DE (1) | DE69931209T2 (en) |
Cited By (49)
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US6361547B1 (en) * | 1998-03-10 | 2002-03-26 | Cordis Corporation | Embolic coil hydraulic deployment system |
US20020121472A1 (en) * | 2001-03-01 | 2002-09-05 | Joseph Garner | Intravascular filter retrieval device having an actuatable dilator tip |
US20020151915A1 (en) * | 1998-03-10 | 2002-10-17 | Grant Hieshima | Small diameter embolic coil hydraulic deployment system |
EP1266630A1 (en) * | 2001-06-14 | 2002-12-18 | Cordis Neurovascular, Inc. | Aneurysm embolization device and deployment system |
US20030004525A1 (en) * | 2001-06-28 | 2003-01-02 | Eric Cheng | Method and apparatus for placing a medical agent into a vessel of the body |
US6544275B1 (en) * | 2000-08-11 | 2003-04-08 | Scimed Life Systems, Inc. | Vaso-occlusive coils with selectively flattened areas |
US6544225B1 (en) * | 2000-02-29 | 2003-04-08 | Cordis Neurovascular, Inc. | Embolic coil hydraulic deployment system with purge mechanism |
WO2002054943A3 (en) * | 2001-01-10 | 2003-04-24 | Cordis Neurovascular Inc | Embolic coil introducer system |
US20030093087A1 (en) * | 2001-11-15 | 2003-05-15 | Jones Donald K. | Embolic coil retrieval system |
US20030093097A1 (en) * | 2001-11-15 | 2003-05-15 | Ernesto Avellanet | Aneurysm embolic device with an occlusive member |
US20030093108A1 (en) * | 2001-11-15 | 2003-05-15 | Ernesto Avellanet | Aneurysm neck cover for sealing an aneurysm |
US20030093094A1 (en) * | 2001-11-15 | 2003-05-15 | Roberto Diaz | Small diameter deployment system with improved headpiece |
US6572628B2 (en) | 2001-06-28 | 2003-06-03 | Cordis Neurovascular, Inc. | Method and apparatus for placing a medical agent into a vessel of the body |
US20030204170A1 (en) * | 2002-04-26 | 2003-10-30 | Witham Richard N. | Noninvasive medical instrument |
EP1400209A1 (en) | 2002-09-20 | 2004-03-24 | Cordis Neurovascular, Inc. | Detachable introducer for a medical device deployment system |
EP1400208A1 (en) * | 2002-09-20 | 2004-03-24 | Cordis Neurovascular, Inc. | Introducer for a medical device deployment system |
US20040068289A1 (en) * | 2001-09-18 | 2004-04-08 | Eric Cheng | Method for placing a medical agent into a vessel of the body |
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US20050043585A1 (en) * | 2003-01-03 | 2005-02-24 | Arindam Datta | Reticulated elastomeric matrices, their manufacture and use in implantable devices |
US20060116714A1 (en) * | 2004-11-26 | 2006-06-01 | Ivan Sepetka | Coupling and release devices and methods for their assembly and use |
US20060241682A1 (en) * | 2003-12-08 | 2006-10-26 | Kurz Daniel R | Intravascular device push wire delivery system |
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US20080086163A1 (en) * | 2006-10-10 | 2008-04-10 | Jones Donald K | Embolic coil having stretch resistant member with an attached end and an end with movement freedom |
US20080103479A1 (en) * | 2001-06-11 | 2008-05-01 | Eric Cheng | Delivery system using balloon catheter with side opening and method |
US20080228215A1 (en) * | 2007-03-13 | 2008-09-18 | Micro Therapeutics, Inc. | Implant including a coil and a stretch-resistant member |
US20080281350A1 (en) * | 2006-12-13 | 2008-11-13 | Biomerix Corporation | Aneurysm Occlusion Devices |
US20090054905A1 (en) * | 2007-05-22 | 2009-02-26 | Wilson-Cook Medical Inc. | Embolization coil delivery systems and methods |
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US7763077B2 (en) | 2003-12-24 | 2010-07-27 | Biomerix Corporation | Repair of spinal annular defects and annulo-nucleoplasty regeneration |
US7803395B2 (en) | 2003-05-15 | 2010-09-28 | Biomerix Corporation | Reticulated elastomeric matrices, their manufacture and use in implantable devices |
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US11707607B2 (en) | 2014-04-15 | 2023-07-25 | Qmax, Llc | Helical balloon catheter |
US9713475B2 (en) | 2014-04-18 | 2017-07-25 | Covidien Lp | Embolic medical devices |
Also Published As
Publication number | Publication date |
---|---|
CA2264988A1 (en) | 1999-09-10 |
DE69931209D1 (en) | 2006-06-14 |
EP0941704B1 (en) | 2006-05-10 |
CA2264988C (en) | 2009-02-24 |
JPH11313829A (en) | 1999-11-16 |
JP3930189B2 (en) | 2007-06-13 |
DE69931209T2 (en) | 2007-03-08 |
EP0941704A1 (en) | 1999-09-15 |
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